Table 2. Betweenness and closeness...

Table 2.

Betweenness and closeness measures based on clusters

Node	Cluster	Betweenness (color scale)	Closeness (color scale)
179	Palm oil	39.30505	0.00214
115	Wastewater treatment	147.88142	0.00226
83	Recycling	113.42973	0.00224
79	Biodiesel	46.84975	0.00215
76	Effluents	113.49424	0.00226
71	Scanning electron microscopy	94.84252	0.00223
66	Efficiency	270.79408	0.00237
55	Catalysts	76.14047	0.00221
53	Adsorption	44.73262	0.00215
54	Fuels	152.36547	0.00230
53	Oil shale	181.98128	0.00230
49	Waste incineration	99.92967	0.00224
47	Waste disposal	164.39965	0.00230
45	Construction industry	186.12546	0.00228
41	Pollution	152.50284	0.00229
40	Chemical oxygen demand	131.45006	0.00227
39	Diesel engines	45.63466	0.00216
41	Fourier transform infrared spectroscopy	102.73276	0.00225
40	Response surface methodology	68.27012	0.00219
39	Water pollution	149.58232	0.00230

Node	Cluster	Betweenness(color scale)	Closeness(color scale)
179	Palm oil	39.30505	0.00214
115	Wastewater treatment	147.88142	0.00226
83	Recycling	113.42973	0.00224
79	Biodiesel	46.84975	0.00215
76	Effluents	113.49424	0.00226
71	Scanning electron microscopy	94.84252	0.00223
66	Efficiency	270.79408	0.00237
55	Catalysts	76.14047	0.00221
53	Adsorption	44.73262	0.00215
54	Fuels	152.36547	0.00230
53	Oil shale	181.98128	0.00230
49	Waste incineration	99.92967	0.00224
47	Waste disposal	164.39965	0.00230
45	Construction industry	186.12546	0.00228
41	Pollution	152.50284	0.00229
40	Chemical oxygen demand	131.45006	0.00227
39	Diesel engines	45.63466	0.00216
41	Fourier transform infrared spectroscopy	102.73276	0.00225
40	Response surface methodology	68.27012	0.00219
39	Water pollution	149.58232	0.00230

Source: Table by the authors